When did Sarah Boone die?

Sarah Boone, an African American who lived near New Haven, CT. patented improvements to the ironing board. The reason you can find so many people asking about her biography without much success is there isn't a lot known about her other than the patent submission.

You can see an image of the actual Patent itself at the US Patent & Trademark Office website.

I have found several references to her being born on May 18, 1867 in Summit, Pike County, Mississippi, with no solid sources given, which means students need to do more research so we can get some solid reference sources on this amazing woman.